Compose v2: improve parsing of dry-run building JSON events (#976)

* Catch more warnings that shouldn't be there.

* Add explicit handling of dry-run image build JSON events.

These produce some one-off ID values that don't make any sense as ID values.

tests/integration/targets/docker_compose_v2/tasks/main.yml

@@ -14,6 +14,7 @@
     name_prefix: "{{ 'ansible-docker-test-%0x' % ((2**32) | random) }}"
     cnames: []
     dnetworks: []
+    images: []
 
 - debug:
     msg: "Using name prefix {{ name_prefix }}"
@@ -35,7 +36,7 @@
         name: "{{ item }}"
         state: absent
         force_kill: true
-      with_items: "{{ cnames }}"
+      loop: "{{ cnames }}"
       diff: false
 
     - name: "Make sure all networks are removed"
@@ -43,7 +44,13 @@
         name: "{{ item }}"
         state: absent
         force: true
-      with_items: "{{ dnetworks }}"
+      loop: "{{ dnetworks }}"
+      diff: false
+
+    - name: "Make sure all images are removed"
+      docker_image_remove:
+        name: "{{ item }}"
+      loop: "{{ images }}"
       diff: false
 
   when: docker_has_compose and docker_compose_version is version('2.18.0', '>=')